Buckle



FIG. 1 is a front view of a buckle, showing my new design;

FIG. 2 is a back view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof.

In the drawings, the broken lines illustrate portions of the article which form no part of the claimed design. 

CLAIM The ornamental design for a buckle, as shown and described. 